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Jinyoung You,Yu-Byeol Jeon,현상환,박수봉,이은송 사단법인 한국동물생명공학회 2010 한국동물생명공학회지 Vol.25 No.4
The objective of this study was to examine the reproductive characteristics of cloned miniature piglets produced from surrogate domestic pigs. Somatic cell nuclear transfer (SCNT) miniature pig embryos were transferred into domestic pigs. As controls, domestic pigs of the same breed with surrogates for SCNT embryos and miniature pigs of the same breed with the somatic cell donor were bred by artificial insemination and natural mating, respectively. Surrogate domestic pigs that farrowed cloned miniature piglets had a significantly longer gestation length (118.1 days)than conventionally bred domestic (115.4 days) and miniature (115.5 days) pigs. Furthermore, the birth weight of cloned miniature piglets produced from domestic pigs (743 g) was significantly greater than that of miniature piglets produced by natural breeding (623 g). Also, cloned miniature piglets had a significantly lower weaning rate (49.7%)than conventionally produced domestic (91.5%) and miniature (100%) piglets. No differences were observed between female and male cloned piglets in gestation length, litter size, birth weight, or weaning rate. Our results demonstrate that gestation length is extended in domestic pigs that are transferred with SCNT miniature pig embryos and that cloned miniature piglets have increased birth weight and high pre-weaning mortality.
You, Jin-Young,Jeon, Yu-Byeol,Hyun, Sang-Hwan,Park, Soo-Bong,Lee, Eun-Song 韓國受精卵移植學會 2010 한국동물생명공학회지 Vol.25 No.4
The objective of this study was to examine the reproductive characteristics of cloned miniature piglets produced from surrogate domestic pigs. Somatic cell nuclear transfer (SCNT) miniature pig embryos were transferred into domestic pigs. As controls, domestic pigs of the same breed with surrogates for SCNT embryos and miniature pigs of the same breed with the somatic cell donor were bred by artificial insemination and natural mating, respectively. Surrogate domestic pigs that farrowed cloned miniature piglets had a significantly longer gestation length (118.1 days) than conventionally bred domestic (115.4 days) and miniature (115.5 days) pigs. Furthermore, the birth weight of cloned miniature piglets produced from domestic pigs (743 g) was significantly greater than that of miniature piglets produced by natural breeding (623 g). Also, cloned miniature piglets had a significantly lower weaning rate (49.7%) than conventionally produced domestic (91.5%) and miniature (100%) piglets. No differences were observed between female and male cloned piglets in gestation length, litter size, birth weight, or weaning rate. Our results demonstrate that gestation length is extended in domestic pigs that are transferred with SCNT miniature pig embryos and that cloned miniature piglets have increased birth weight and high pre-weaning mortality.
Design and development of immersive scenario
( Jeeheon Ryu ),( Hyungju Lee ),( Seungbeom Yu ),( Byeol Jeon ),( Jiyeon Lee ) 한국교육공학회 2014 한국교육공학회 학술대회발표자료집 Vol.2014 No.2
The purpose of this presentation is to show the process of design and development of immersive scenario for virtual learning environment. In an effort of developing a realistic classroom in digitalized manner, virtual characters and behaviors were created based on iterative design and development process. In this presentation the method of creating virtual characters`` appearance, motion, and gestures will be presented. Additionally, from a theoretical perspective, it will be discussed how the ratio of screen size is important to amplify the perception of presence. Some technical issues will be included in the presentation of how to build an immersive virtual reality.
Seong-Sung Kwak,Seung-A Jeong,Yu-Byeol Jeon,Sang-Hwan Hyun 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1
The present study investigated the effects of resveratrol (a phytoalexin with various pharmacological activities) during in vitro maturation (IVM) of porcine oocytes on nuclear maturation, intracellular glutathione (GSH), and reactive oxygen species (ROS) levels, gene expressions in matured oocytes, cumulus cells, and IVF-derived blastocysts, and subsequent embryonic development after parthenogenetic activation (PA) and in vitro fertilization (IVF). In the nuclear maturation after 44 h IVM, the groups of 0.1, 0.5, and 2.0 μM (83.0%, 84.1%, and 88.3%, respectively) had no significant difference compared to the control (84.1%), but the group of 10.0 μM decreased the nuclear maturation (75.0%) significantly (p<0.05). The groups of 0.5 and 2.0 μM showed a significant (p<0.05) increase in intracellular GSH levels compared to the control and 10.0 μM groups. Intracellular ROS level of oocytes matured with 2.0 μM resveratrol was significantly (p<0.05) decreased compared to the other groups. Oocytes treated with 2.0 μM resveratrol during IVM had significantly higher blastocyst formation rate, and total cell numbers after PA (62.1% and 49.1 vs. 48.8%, and 41.4, respectively) and IVF (20.5% and 54.0 vs. 11.0% and 43.4, respectively) compared to the control group. Cumulus-oocytes complex (COCs) treated with 2.0 μM resveratrol were showed lower (p<0.05) expressions of apoptosis-related genes in both matured oocytes (Bax, Bak, and Caspase-3) and cumulus cells (Bax). In IVF-derived blastocysts derived from 2.0 μM resveratrol treated oocytes had also decreased (p<0.05) expression of Bak compared to the control. In conclusion, the 2.0 μM resveratrol supplementation during IVM improved the developmental potential of PA and IVF in porcine embryos by increasing the intracellular GSH level, decreasing ROS level, and regulating apoptosis-related genes expression during oocyte maturation.
Seong-Sung Kwak,Seung-A Jeong,Yu-Byeol Jeon,Sang-Hwan Hyun 한국동물생명공학회(구 한국동물번식학회) 2011 발생공학 국제심포지엄 및 학술대회 Vol.2011 No.1
In this study, we examined the effects of porcine granulocyte-macrophage colonystimulating factor (pGM-CSF) on in vitro development of porcine embryos produced by somatic cell nuclear transfer (SCNT) at first time. The objective of present study was to verify effects of pGM-CSF on SCNT-derived blastocyst formation and evaluate gene expressions and qualities of the blastocyst formed after pGM-CSF treatment. Data were analyzed with SPSS 17.0 using Duncan’s multiple range test. A total 522 cloned embryos in 6 replicates were treated with 10 ng/ml concentration of pGM-CSF during in vitro culture (IVC). It was demonstrated that treatment of 10 ng/ml pGM-CSF could increase blastocyst formation and total cell number in blastocyst significantly (p<0.05) compared to the control (12.3% and 41.4 vs. 9.0% and 34.7, respectively). However, there was no any effect on cleavage rate. It was found that the number of cells in the inner cell mass (ICM) and trophectoderm (TE) were significantly increased compared to the control (4.4 and 31.9, respectively) when cloned embryos were cultured with 10 ng/ml pGM-CSF (6.0 and 43.0, respectively). It was also found that treatment of 10 ng/ml pGM-CSF significantly (p<0.05) increased POU5F1 and Cdx2 mRNA expressions in blastocysts. In addition, Bcl-2 mRNA expression was found to be significantly (p< 0.05) up-regulated in blastocysts in the pGM-CSF supplemented group compared to the control. In conclusion, these results suggest that pGM-CSF may improve the quality and developmental viability of porcine cloned embryos by enhancing nuclear reprogramming via regulating transcription factors expression.